(A) proposing the Lend-Lease Act
(B) ** creating the Manhattan project
(C) declaring war on the Axis powers
EXPLANATIONS BELOW
Concept note-1: -In August 1939, Einstein wrote to U.S. President Franklin Roosevelt to warn him that the Nazis were working on a new and powerful weapon: an atomic bomb. Fellow physicist Leo Szilard urged Einstein to send the letter and helped him draft it.
Concept note-2: -Einstein had written to inform Roosevelt that recent research on fission chain reactions utilizing uranium made it probable that large amounts of power could be produced by a chain reaction and that, by harnessing this power, the construction of “extremely powerful bombs” was conceivable.
Concept note-3: -Roosevelt decided that the letter required action, and authorized the creation of the Advisory Committee on Uranium.
Concept note-4: -The Einstein-Szilard letter to President Roosevelt changed the course of history by prompting American government involvement in nuclear research. The letter led to the establishment of the Manhattan Project. By the summer of 1945, the United States had built the world’s first atomic bomb.